US20020017273A1 - Assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, and an internal combustion engine provided with this assembly - Google Patents

Assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, and an internal combustion engine provided with this assembly Download PDF

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Publication number
US20020017273A1
US20020017273A1 US09/835,957 US83595701A US2002017273A1 US 20020017273 A1 US20020017273 A1 US 20020017273A1 US 83595701 A US83595701 A US 83595701A US 2002017273 A1 US2002017273 A1 US 2002017273A1
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US
United States
Prior art keywords
rocker arm
assembly
cylinder head
engine
support body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/835,957
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English (en)
Inventor
Giancarlo Dellora
Carlo Prola
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iveco SpA
Original Assignee
Iveco Fiat SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iveco Fiat SpA filed Critical Iveco Fiat SpA
Assigned to IVECO FIAT S.P.A. reassignment IVECO FIAT S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DELLORA, GIANCARLO, PROLA, CARLO
Publication of US20020017273A1 publication Critical patent/US20020017273A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms

Definitions

  • the present invention relates to an assembly providing an engine brake system for an internal combustion engine, in particular for an internal combustion engine of Diesel type of an industrial vehicle, and comprising a cam distribution shaft and, for each cylinder of the engine, a relative rocker arm for controlling the lift of the exhaust valves of this cylinder.
  • an engine brake device comprising, for each rocker arm associated with the exhaust, an eccentric bushing interposed between the rocker arm and a relative support pin connected directly to the cylinder head of the engine.
  • the bushing in particular has a cylindrical outer surface on which the rocker arm is mounted in an oscillating manner, and an eccentric through axial hole engaged by the support pin.
  • the engine brake device further comprises, for each cylinder, a hydraulic actuator obtained directly in the cylinder head of the engine and controlled by an electronic control unit in order to rotate the eccentric bushing about the axis of the support pin during the phases of actuation of the engine brake.
  • the axis of oscillation of the rocker arm is displaced, reducing the play present between this rocker arm and the relative exhaust valves so as to provide an exhaust valve lift that is not zero and is defined by the second section of the cams, during the final part of the intake phase and the phases of compression and expansion, in order to dissipate the compression energy that is generated within the relative cylinder.
  • the engine brake device of the type described above is integrated into the cylinder head of the engine, thereby substantially conditioning its design and manufacture; the engine brake device is therefore dedicated to a particular type of engine and has to be completely re-designed from time to time. Moreover, the use of the engine brake in existing engines that do not contain it is largely impossible without a compete re-design of the cylinder head.
  • the object of the present invention is to provide an assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, which makes it possible simply and economically to resolve the above-mentioned problems.
  • the present invention therefore relates to an assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, which engine comprises a plurality of cylinders, a cylinder head provided, for each such cylinder, with at least one exhaust valve and, for each such exhaust valve, with a relative control cam having a profile comprising at least one section that can be selectively actuated by varying the valve play, characterised in that it comprises, for each cylinder, a support body adapted to be connected to the cylinder head, at least one rocker arm support spindle borne by the support body, an eccentric bushing, a rocker arm adapted to be interposed between an exhaust valve and a control cam and that can be coupled to the rocker arm support spindle by means of the eccentric bushing in order to oscillate about an axis and actuator means adapted to rotate the eccentric bushing with respect to the support body about the rocker arm support spindle in order to displace the axis of oscillation of the rocker arms and to vary the valve play between these rocker
  • the present invention also relates to an internal combustion engine, in particular of an industrial vehicle.
  • the invention therefore relates to an internal combustion engine, in particular of an industrial vehicle, comprising a plurality of cylinders, a cylinder head provided, for each such cylinder, with at least one exhaust valve and, for each such exhaust valve, with a relative control cam having a profile comprising at least one section that can be selectively actuated by varying the valve play, and, for each cylinder, an eccentric bushing and a rocker arm interposed between the exhaust valve and a control cam and coupled to a rocker arm support spindle by means of the eccentric bushing in order to oscillate about a relative axis and actuator means adapted to rotate the eccentric bushing with respect to the cylinder head about the rocker arm support spindle in order to displace the axis of oscillation of the rocker arms and to vary the valve play between these rocker arms and the exhaust valves, characterised in that it comprises a support body for the rocker arm support spindles coupled to the cylinder head.
  • FIG. 1 is an exploded and perspective view of a preferred embodiment of the assembly for providing an engine brake system for an internal combustion engine of the present invention
  • FIG. 2 is similar to FIG. 1 and shows a variant of the assembly of FIG. 1;
  • FIG. 3 shows, partly in cross-section, a detail of the assembly of FIGS. 1 and 2;
  • FIGS. 4 and 5 show, in plan view, the assembly of FIGS. 1 and 2 respectively.
  • an internal combustion engine of an industrial vehicle advantageously of supercharged Diesel type, is shown overall by 1 and is not shown in detail as it has a structure that is known per se; it comprises a plurality of cylinders and a cylinder head 2 (FIG. 3) provided, for each cylinder, with two exhaust valves 3 and two supply valves 3 a (shown in part).
  • valves 3 , 3 a of a single cylinder are shown; it will be appreciated that the valves of the other cylinders and the corresponding parts of the engine 1 are completely analogous to those illustrated and/or described below.
  • Each valve 3 , 3 a can slide axially in a relative fixed tubular guide (not shown) and is adapted to close a respective exhaust or supply port (not shown) obtained in the cylinder head 2 .
  • the exhaust ports communicate with a manifold (not shown) adapted to convey the exhaust gases from all the exhaust ports associated with the cylinders.
  • valves 3 , 3 a are held in the closed position in a known manner by respective springs (not shown); the former are controlled by a rocker arm 18 and the latter by a rocker arm 18 a by means of respective crossbars shown by 19 and 19 a.
  • Each of the rocker arms 18 , 18 a comprises two opposing arms 27 and 28 .
  • the arm 28 bears a member 29 adapted to cooperate with the relative crossbar 19 , 19 a, while one end of the arm 27 is connected in an adjustable manner (FIG. 3) to a member 30 which is coupled to a cam distribution shaft (not shown) of the engine 1 by means of a relative recall rod 31 .
  • Each member 29 in particular comprises a hemispherical end head 32 facing the relative crossbar 19 , 19 a and adapted to cooperate with a corresponding hemispherical seat 33 of this crossbar 19 , 19 a.
  • valve play used in this description specifies the small empty stroke that the contact member of the rocker arm, in this case the head 32 , has to travel to come into contact with the corresponding thrust member of the valves 3 , in this case the seat 33 of the crossbar 19 , from a zero lift position of the relative cam (or, where specified, from another position).
  • the cams (not shown) of the distribution shaft adapted to control the exhaust valves 3 have a modified profile of known type comprising sections that can be selectively actuated by varying the valve play.
  • the profile of these cams is in particular formed substantially from a first section of zero lift (i.e. defined by a portion of the base circle of the cam), corresponding substantially to the majority of the intake phase of the relative cylinder, a second section of small constant lift, extending over an angular amplitude corresponding to the final part of the intake phase and to the phases of compression and expansion, and a third convex lobe section corresponding substantially to the exhaust phase and defining a lift law of the valves 3 of conventional type.
  • the rocker arms 18 , 18 a form part of an assembly 39 adapted to provide an engine brake system of the engine 1 associated with the above-described profile.
  • the parts of the assembly 39 relating to the valves 3 of a single cylinder are shown and it will be appreciated that the parts relating to the other cylinders are completely analogous.
  • the assembly 39 comprises a connection body 40 separate from the cylinder head 2 , disposed in abutment on a surface 41 of the head 2 , and rigidly connected to the head 2 , in particular by means of a pair of parallel screws 42 , 43 .
  • the body 40 comprises a base 44 disposed in abutment on the cylinder head 2 and comprising two adjacent portions 45 and 46 , of which the portion 45 is engaged by the screw 42 and rigidly bears a fork 47 extending in a projecting manner in order to support the rocker arm 18 .
  • the fork 47 in particular supports a rocker arm support spindle formed by a pin 50 , which extends along an axis 51 between the arms of the fork 47 and with which an eccentric bushing 52 is connected.
  • the bushing 52 has an inner cylindrical surface coupled to the pin 50 so as to be able to rotate about the axis 51 , and an outer cylindrical surface 55 on which an intermediate portion 56 of the rocker arm 18 is keyed in order to allow this rocker arm 18 to oscillate about an axis 57 parallel and eccentric with respect to the axis 51 .
  • the bushing 52 rigidly bears, at one axial end, a radial lever 60 actuated by an actuator 62 in order to rotate the bushing 52 about the axis 51 with respect to the body 40 and to displace the axis 57 of oscillation of the rocker arm 18 .
  • the actuator 62 comprises a cylinder 63 rigidly connected to an arm of the fork 47 , for instance by means of screws (not shown) and a stem 64 which projects from the cylinder 63 and can slide with respect to this cylinder 63 .
  • the stem 64 is connected at one end to the lever 60 by means of a pin 65 which is parallel to the axis 51 and engages a radial groove obtained at one end of this lever 60 .
  • the portion 46 rigidly bears a substantially prismatic member 70 , to which a rocker arm support spindle formed by a pin 71 is fixed by means of the screw 43 .
  • the rocker arm 18 a comprises an intermediate hollow portion 73 which partly houses the member 70 and is hinged on the pin 71 in order to oscillate about an axis 75 parallel to the axes 51 and 57 .
  • FIGS. 2 and 5 show a variant of the assembly 39 , in which the body 40 does not comprise the portion 46 and the member 70 and is secured to the cylinder head 2 by means of the screw 42 alone, while the rocker arm 18 a (not shown) associated with the intake valves is mounted in an oscillating manner on a pin borne directly by the cylinder head 2 in a known manner (not shown).
  • valve play of the valves 3 is equal to the optimum adjustment value when the second section of the relative cam is active, while there is a substantially greater play when the first section corresponding to the base circle of this cam is active.
  • the axis 57 of oscillation of the rocker arm 18 is lowered by rotating the bushing 52 in order to reduce the valve play of the valves 3 in an almost complete manner, i.e. in order to obtain a residual play equal to the optimum adjustment value when the first section of the distribution cam corresponding to the base circle is active.
  • the valves 3 remain open by a quantity corresponding to the lift of the second section of the profile of the cams, dissipating the compression energy generated in the cylinder by drawing towards the exhaust manifold.
  • the assembly 39 makes it possible to provide an engine brake system which is not dependent on a specific type of cylinder head 2 .
  • the base 44 can be readily connected to a cylinder head 2 of substantially any type and structure having a support surface 41 and, on the other hand, the actuator 62 is separate from the head 2 , in contrast to known solutions in which it was incorporated in the cylinder head 2 .
  • the provision of the engine brake system described by means of the assembly 29 does not substantially condition the design and manufacture of the cylinder head 2 and therefore the system as described may be applied to engines of different types, whether new or already available, which do not contain it.
  • the actuator 62 could in particular be rigidly connected to the cylinder head 2 rather than to the body 40 , a single actuator could be provided for all the rocker arms 18 and/or the pins 50 and 71 could be made in one piece and extend along the same axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Braking Arrangements (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Braking Systems And Boosters (AREA)
US09/835,957 2000-04-18 2001-04-16 Assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, and an internal combustion engine provided with this assembly Abandoned US20020017273A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITT02000A000365 2000-04-18
IT2000TO000365A IT1320054B1 (it) 2000-04-18 2000-04-18 Assieme per la realizzazione di un sistema di freno motore per unmotore endotermico, in particolare per un veicolo industriale, e

Publications (1)

Publication Number Publication Date
US20020017273A1 true US20020017273A1 (en) 2002-02-14

Family

ID=11457675

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/835,957 Abandoned US20020017273A1 (en) 2000-04-18 2001-04-16 Assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, and an internal combustion engine provided with this assembly

Country Status (7)

Country Link
US (1) US20020017273A1 (de)
EP (1) EP1148213B1 (de)
JP (1) JP2002004822A (de)
AT (1) ATE307966T1 (de)
DE (1) DE60114282T2 (de)
ES (1) ES2248185T3 (de)
IT (1) IT1320054B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2197825A1 (es) * 2002-06-21 2004-01-01 Consejo Sup De Investig Cienti Alimento microencapsulado para larvas de peces y procedimiento para su elaboracion.
US20090071436A1 (en) * 2006-01-17 2009-03-19 Markus Dietrich Gas exchange valve actuating device
CN113187578A (zh) * 2021-05-31 2021-07-30 宁波东方动力部件有限公司 一种内燃机缸内制动装置

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005039368B9 (de) * 2005-08-08 2007-11-08 Meta Motoren- Und Energie-Technik Gmbh Schaltbarer Ventilbetätigungsmechanismus
DE102006036246B4 (de) * 2006-08-03 2016-09-15 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Motorbremssystem für eine Brennkraftmaschine
US7556004B2 (en) 2006-10-16 2009-07-07 Caterpillar Inc. Bactrian rocker arm and engine using same
GB2448167B (en) * 2007-04-04 2011-07-20 Mechadyne Plc Valve actuating system
BRPI0812183A2 (pt) * 2007-06-01 2014-11-18 Jacobs Vehicle Systems Inc Sistema de acionamento de válvula variável
US7921819B2 (en) 2008-04-25 2011-04-12 Mechadyne Plc Valve actuating system
AT505832B1 (de) * 2008-09-18 2011-01-15 Avl List Gmbh Motorbremseinrichtung für eine brennkraftmaschine
US8539920B2 (en) * 2009-01-22 2013-09-24 Scuderi Group, Inc. Valve lash adjustment system for a split-cycle engine
IT1397350B1 (it) 2009-06-11 2013-01-10 Streparava S P A Gruppo di azionamento per un freno motore di un autoveicolo.
IT1403549B1 (it) * 2010-12-17 2013-10-31 Htp S R L Perno di guida per un apparato di distribuzione di un motore endotermico e relativo metodo di realizzazione
KR102335529B1 (ko) 2017-09-12 2021-12-03 현대자동차주식회사 엔진 브레이크 장치
CN108843420B (zh) * 2018-07-17 2021-04-27 力帆实业(集团)股份有限公司 适用于通用内燃机的摇臂安装结构
CN109057984B (zh) * 2018-07-17 2021-05-28 力帆实业(集团)股份有限公司 用于通用内燃机的气缸盖

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851023A (en) * 1956-04-26 1958-09-09 Leroy A Durkan Variable valve timing
DE3506964A1 (de) * 1985-02-27 1986-08-28 Motorenfabrik Hatz Gmbh & Co Kg, 8399 Ruhstorf Dekompressionsvorrichtung an brennkraftmaschinen
IT1255447B (it) * 1991-11-08 1995-10-31 Iveco Fiat Motore provvisto di un dispositivo di frenatura continua, particolarmente per un veicolo industriale.
JP3277231B2 (ja) * 1995-03-30 2002-04-22 日産ディーゼル工業株式会社 車両用ディーゼルエンジンのデコンプレションブレーキ
JPH08338214A (ja) * 1995-06-15 1996-12-24 Unisia Jecs Corp デコンプレッションブレーキ装置
JPH09303162A (ja) * 1996-05-17 1997-11-25 Nissan Diesel Motor Co Ltd 圧縮圧開放式ブレーキ装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2197825A1 (es) * 2002-06-21 2004-01-01 Consejo Sup De Investig Cienti Alimento microencapsulado para larvas de peces y procedimiento para su elaboracion.
US20090071436A1 (en) * 2006-01-17 2009-03-19 Markus Dietrich Gas exchange valve actuating device
US7827958B2 (en) * 2006-01-17 2010-11-09 Daimler Ag Gas exchange valve actuating device
CN113187578A (zh) * 2021-05-31 2021-07-30 宁波东方动力部件有限公司 一种内燃机缸内制动装置

Also Published As

Publication number Publication date
DE60114282T2 (de) 2006-03-30
ITTO20000365A1 (it) 2001-10-18
EP1148213B1 (de) 2005-10-26
JP2002004822A (ja) 2002-01-09
ATE307966T1 (de) 2005-11-15
DE60114282D1 (de) 2005-12-01
IT1320054B1 (it) 2003-11-12
EP1148213A1 (de) 2001-10-24
ES2248185T3 (es) 2006-03-16
ITTO20000365A0 (it) 2000-04-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: IVECO FIAT S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DELLORA, GIANCARLO;PROLA, CARLO;REEL/FRAME:012224/0428

Effective date: 20010829

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION